Uncertainty analysis of HEC-HMS model using the GLUE method for flash flood. CEE Engineering Hydrology HEC-HMS Bare Essentials Tutorial and Example comprehensive or to replace the HEC-HMS documentation; rather it is a. The Hydrologic Modeling System (HEC-HMS) is designed to simulate the complete hydrologic processes of dendritic watershed systems.
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Step by Step: Flood Hazard Mapping | UN-SPIDER Knowledge Portal
The output is the stream link grid, with the default name StrLnk that can be overwritten. After the computations are complete, the BasinSlope field in the input Subbasin feature class is populated. The output is the Flow Accumulation Grid having a default name of Fac that can be overwritten. Catchment Grid Delineation This function creates a grid in which each cell carries a value grid code indicating to which catchment the cell belongs.
Related Practices Recommended Practice: These lines are used to compute distances between cross-sections in the over bank areas. Entering Flow Data and Boundary Conditions. Each line in the feature class carries the identifier of the catchment in which it resides. The issue of non multi-part features is taken care of for the tutorial dataset. Subwatersheds delineated from a set of points are therefore by definition non overlapping because the watershed draining to a point that is within another watershed is excluded from the subwatershed of the downstream point.
Zoom-in to the network and click the mouse along the drainage line to create your point of interest. Hed with your mouse at any point to determine the flow path. You will get a message indicating that 1 point has been processed.
Step by Step: Flood Hazard Mapping
You can use select by attributes option to do this. It allows displaying the profile of selected river reach es.
Drainage Line Polygons file name: We will not split any river segments in this exercise. To perform a batch watershed delineation: Add wshslopepct percent slope for watershed grid to the map document. Batch Watershed Delineation This function delineates the watershed upstream of each point in an input Batch Point feature class.
As a result of this merging, we now have 12 sub-basins and 15 river segments in the project. Double click at this point to finish digitizing the Tule Tributary. This function fills the sinks in a grid. The BatchDone and SnapOn options can be used to turn on select 1 or off select 0 the batch processing and stream snapping for that point. Save the flow data give whatever title you likeand close the Steady Flow editor.
Terrain processing hecc using the DEM to create a stream network and catchments. Flow Path Tracing The flow path defines the path of flow from the selected point to the outlet of the catchment following the steepest descent.
Flow Accumulation Grid file hm WatershedPoint and Watershed are default names that can be overwritten.
Before you proceed, it is a good practice to perform a quality check on the data to make sure no erroneous information is imported from GIS. You can treat these methods as tentative which can be changed in HMS model.
Similar to Ineffective flow areas, the positions and elevations of the intersection of this obstruction with cross-sections needs to be stored in a table. This Str grid contains a value of “1” for all the tutorisl in the input flow accumulation grid Fac that have a value greater than the given threshold as shown in above figure. The function needs as input a raw DEM and a linear feature class like the river network that both have to be present in the map document.
You should now see the Arc Hydro toolbar added to ArcMap. You can also look at the log file and make sure there are no errors in the data by scrolling to the bottom of the log file as shown below:.
Select Characteristics Basin Centroid. A new map data frame with the analysis name Steady Flow will be added to ArcMap with the terrain data. The output is Drainage Point with the tutofial name DrainagePoint that can be overwritten. After digitizing, save the edits and stop editing.
HEC-HMS Exercise for CEK at University of Texas at Austin
Close the dockable window, and save the map document. Save your HMS project. For example, areas behind bridge abutments representing contraction and expansion zones can be considered as ineffective flow areas.
We will approximate the bridge width to about ft station todeck elevation as 84 ft high chord and 6ft deep low chord as shown below:. Input to the batch subwatershed delineation function is a point feature class with point locations of interest. The next step is to prepare a look-up table that will have curve numbers tutoeial different combinations of land uses and soil groups.
With the attribute table open, right click on SoilCode field to open the field calculator and then equate SoilCode to component. hce
You can check the Slp field in the input River1 or whatever name you have for your input river feature class is populated. This function tutorila subbasins over grids and compute average value for each basin.
To create the channel centerline in Banks feature classstart editing, and choose Create New Feature as the Task, and Banks as the Target as shown below:. Confirm input feature classes for Subbasin and River, and click OK. Besides these attributes, you must enter additional information about the bridge s such as the name and width in its attribute table as shown below. Zoom-in to the most upstream part of the ceedar creek tributaries.